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In view of the current food crisis, it i...

In view of the current food crisis, it is said, that we need another green revolution. Highlight the major limitations of the earlier green revolution.

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Limitations of green revolution : (i) The Green Revolution succeeded increases the food supply but, yet it was not enough to feed the growing human population. (ii) Incrcased yields have partly been due to the use of improved crop varieties, but mainly due to the use of better management practices and use of agrochemicals (fertilisers and pesticides). (iii) However, for farmers in the developing world, agrochemicals are often too expensive, and further increases in yield with existing varieties are not possible using conventional breeding. (iv) Use of agrochemicals causes eutrophication in aquatic ecosystems and biomagnification in terrestrial ecosystems. (v) Water logging and soil salinity are some of the problems that have come in the wake of green revolution
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Knowledge Check

  • Green revolution in India occurred during :

    A
    1965s
    B
    1970s
    C
    1980s
    D
    1950s

  • Green revolution succeeded in increasing the yield of the crop by a factor

    A
    4
    B
    3
    C
    2
    D
    5

  • The green revolution succeeded in tripling the food supply but yet it was not enough to feed the growing human population increased yield have mainly been due to the use of (a) Improved crop variety (b) Better management practices (c) Agrochemicals(fertilizers and pesticides) (A) a and b (B) b and c (C) a and c (D) a, b and c

    A
    a and b
    B
    b and c
    C
    a and c
    D
    a, b and c

    • Similar Questions

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    Name the improved characteristics of wheat that helped India to achieve green revolution.

    Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.

    An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrode is measured with the help of an ideal voltmetar, and which can be varied by moving jockey 'J' on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2omega . The resistance of 100 cm long potentiometer wire is 8 omega . The photo current is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm^(2) at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an indepdent circuit. The wavelength of various colours is as follows : |{:("Light",underset("Violet")(1),underset("Blue")(2),underset("Green")(3),underset("Yellow")(4),underset("Orange")(5),underset("Red")(6)),(lambda "in" Årarr,4000-4500,4500-5000,5000-5500,5500-6000,6000-6500,6500-7000):}| When other light falls on the anode plate the ammeter reading remains zero till, jockey till, jockey is moved from the end P to the middle point on the wire PQ. Thereafter the deflection is recorded in the ammeter. The maximum kinetic energy of the emitted electron is :

    An experimental setup of verification of photoelectric effect is shown in the diagram. The voltage across the electrode is measured with the help of an ideal voltmetar, and which can be varied by moving jockey 'J' on the potentiometer wire. The battery used in potentiometer circuit is of 20 V and its internal resistance is 2omega . The resistance of 100 cm long potentiometer wire is 8 omega . The photo current is measured with the help of an ideal ammeter. Two plates of potassium oxide of area 50 cm^(2) at separation 0.5 mm are used in the vacuum tube. Photo current in the circuit is very small so we can treat potentiometer circuit an indepdent circuit. The wavelength of various colours is as follows : |{:("Light",underset("Violet")(1),underset("Blue")(2),underset("Green")(3),underset("Yellow")(4),underset("Orange")(5),underset("Red")(6)),(lambda "in" Årarr,4000-4500,4500-5000,5000-5500,5500-6000,6000-6500,6500-7000):}| When radiation falls on the cathode plate a current of 2muA is recorded in the ammeter. Assuming that the vecuum tube setup follows ohm's law, the equivalent resistance of vacuum tube operating in this case when jockey is at end P.

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